Genetic and acoustic population structuring in the Okinawa least horseshoe bat: are intercolony acoustic differences maintained by vertical maternal transmission?
Article first published online: 20 NOV 2008
© 2008 The Authors. Journal compilation © 2008 Blackwell Publishing Ltd
Volume 17, Issue 23, pages 4978–4991, December 2008
How to Cite
YOSHINO, H., ARMSTRONG, K. N., IZAWA, M., YOKOYAMA, J. and KAWATA, M. (2008), Genetic and acoustic population structuring in the Okinawa least horseshoe bat: are intercolony acoustic differences maintained by vertical maternal transmission?. Molecular Ecology, 17: 4978–4991. doi: 10.1111/j.1365-294X.2008.03975.x
- Issue published online: 20 NOV 2008
- Article first published online: 20 NOV 2008
- Received 16 July 2008; revision received 9 September 2008; accepted 21 September 2008
- echolocation calls;
- gene flow;
- horseshoe bat;
- population genetic structure;
- within-island variation
The origin and meaning of echolocation call frequency variation within rhinolophid bats is not well understood despite an increasing number of allopatric and sympatric examples being documented. A bimodal distribution of mean regional call frequency within the Okinawa-jima Island population of Rhinolophus cornutus pumilus (Rhinolophidae) provided a unique opportunity to investigate geographic call frequency variation early in its development. Individual resting echolocation frequencies, partial mitochondrial DNA D-loop sequences and genotypes from six microsatellite loci were obtained from 288 individuals in 11 colonies across the entire length of the island, and nearby Kume-jima Island. Acoustic differences (5–8 kHz) observed between the north and south regions have been maintained despite evidence of sufficient nuclear gene flow across the middle of the island. Significant subdivision of maternally inherited D-loop haplotypes suggested a limitation of movement of females between regions, but not within the regions, and was evidence of female philopatry. These results support a ‘maternal transmission’ hypothesis whereby the difference in the constant frequency (CF) component between the regions is maintained by mother–offspring transmission of CF, the restricted dispersal of females between regions and small effective population size. We suggest that the mean 5–8 kHz call frequency difference between the regions might develop through random cultural drift.